How to Make Irish Coffee with Whisky: Step-by-Step Guide

If you’ve ever wanted to recreate a romantic, cozy drink like the classic Irish coffee — the kind that warms both body and heart — you’re not alone. But most recipes skip the details that make it truly memorable. What’s the right balance of coffee and whisky? How do you get that rich, velvety layer of cream on top without drowning the flavours? Here's how to do it properly, step by step.

To make a traditional Irish coffee, use 30ml (1 ounce) of Irish whiskey, 150ml (5 ounces) of hot strong coffee, and top with freshly whipped cream. That’s a 1:5 coffee-to-whisky ratio — the key balance tested for over a year to make the drink smooth yet bold.

What Is Irish Coffee, Really?

Irish coffee isn’t just coffee with booze poured in. It’s a carefully balanced drink with a story: created in the 1940s by a bartender at Dublin Airport who wanted to impress an airhostess who didn’t drink alcohol. He crafted a warm, whiskied coffee drink that hid the sharpness of the spirit while enhancing its aroma. The drink became famous not just for its taste, but for the emotion baked into its creation — literally, with a tear dropped into the first cup.

The Right Ingredients & Ratios

The classic recipe calls for very specific amounts:

• Irish whiskey: ~30ml (1 ounce)
• Hot, strong black coffee: 150ml (5 ounces)
• Sugar: 4g (about 1 teaspoon)
• Whipped fresh cream (for topping)

The coffee-to-whiskey ratio is approximately 1:5 — five parts coffee to one part whisky. This ensures the whisky complements rather than overpowers the coffee. The original version didn’t focus much on the coffee bean variety; it just needed to be strong and hot, showing remarkable tolerance for different coffees — unlike the strict requirements for the whisky and technique.

How to Prepare Irish Coffee: Step-by-Step

Follow this method to create an authentic Irish coffee, just like the one served at Dublin Airport in the 1940s.

• Start by brewing a strong black coffee. You’ll need about 150ml (5 ounces).
• Add 4g (around 1 teaspoon) of sugar to the bottom of a warmed Irish coffee glass.
• Pour ~30ml (1 ounce) of Irish whiskey into the glass. Stop when it reaches the first marked line on the traditional Irish coffee glass.
• Next comes the roasting: carefully heat the glass by rotating it over a small flame. Watch for rising steam from the glass’s rim — that’s your cue.
• Once you see vapor, continue rotating the glass while briefly exposing the rim to the flame until the whisky ignites. Let it gently burn for a few seconds.
• (Optional visual effect: turn off the lights to see the blue flame.)
• Pour in the hot coffee up to the second line on the glass.
• Add the sugar and stir until dissolved.
• Top gently with freshly whipped cream, poured over the back of a spoon so it floats on top.

The result? A warm, creamy coffee drink where the whisky aroma meets bold coffee flavours, finished with a silky cream topping.

Why Roast the Glass and Light the Whiskey?

Flaming the whisky isn’t just for show — it lightly cooks off some of the harsh alcohol bite while releasing aromatic vapours. Roasting the glass beforehand helps prevent cracking from the sudden temperature change when you add hot coffee and whiskey. Together, these steps enhance both safety and sensory experience.

Does the Type of Coffee Matter?

Surprisingly, not as much as you’d think. The original recipe used whatever strong, hot black coffee was available. Unlike the whisky or the method, the coffee itself was treated with flexibility. That said, a dark roast with bold, rich flavours will stand up better to the whisky and cream.

Frequently Asked Questions

What’s the correct coffee to whisky ratio in Irish coffee?

The traditional ratio is 1:5 — 150ml (5 ounces) of coffee to 30ml (1 ounce) of Irish whiskey. This balances the strength of the whisky with the richness of the coffee.

Do you need to light the whiskey when making Irish coffee?

No, flaming the whiskey is optional. It was part of the original presentation to reduce alcohol sharpness and add theatre, but it’s not required for a good-tasting drink.

Can I use any type of coffee for Irish coffee?

Yes, the original recipe worked with any strong black coffee. However, a dark roast or bold single origin will complement the whisky and cream better.

What kind of cream should I use for Irish coffee?

Use freshly whipped heavy cream — gently poured over the back of a spoon so it floats on top. Avoid pre-whipped or flavoured creams.

Why is it called Irish coffee?

It was invented in Ireland, specifically at Dublin Airport, by a bartender using Irish whiskey. The name honours both its origin and main alcoholic ingredient.

What’s the story behind the tear in the Irish coffee?

The first Irish coffee reportedly had a teardrop from the bartender mixed in. While this is more legend than fact, it’s become part of the romantic lore of the drink.

Recommended FrontStreet Beans for Irish Coffee

For Irish coffee, we recommend FrontStreet Coffee’s Classic Blend or Black Cocoa Blend. Both offer full-bodied profiles that hold up well under whisky and cream. The Classic Blend provides balanced chocolate and caramel notes, while the Black Cocoa Blend leans into deeper roasted tones with hints of dark chocolate — ideal for cutting through the spirit. Either will create a rich, warming winter drink. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.